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Water-based paint with long opening time and preparation method thereof

A technology of water-based coatings and open time, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as prolonging the opening time and wet edge time of coatings, shortening open time and wet edge time, and affecting the promotion and application of water-based coatings. Achieve the effects of avoiding too long drying time, prolonging open time and wet edge time, and high hardness

Active Publication Date: 2012-08-08
湖南福湘涂料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the open time of organic solvent-based coatings can reach 45 minutes, and the wet edge time can reach 25 minutes, while the open time of water-based coatings is only 15 minutes, and the wet edge time is about 2-6 minutes, which seriously affects the popularization and application of water-based coatings.
[0003] In order to alleviate the above problems, one method is to add organic additives to water-based paints to control the fluidity of the paint and prolong the evaporation time of the liquid. However, only when the amount of organic additives reaches 25% of the total volume of the paint, can it be significantly extended. The open time and wet edge time of the coating, and the increase of organic additives will increase the total content of VOC in the coating combination. With the stricter regulations on the allowable content of VOC in coatings, it is often necessary to reduce the organic additives, resulting in open time with reduced wet edge time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Add 20 g of diethanolamine and 0.2 g of sodium methoxide to the reaction kettle, heat the mixture to 100 degrees Celsius, and after the sodium methoxide is completely dissolved, add 120 g of sunflower oil under the protection of nitrogen, stir and heat to keep the temperature of the mixture at 100 degrees Celsius, use the titration method to measure the residual amine content in the mixture, stop stirring when the conversion rate of diethanolamine reaches 80%, and cool the solution to 65 degrees Celsius, add 0.15g of phosphoric acid, keep it for 15min, then cool to room temperature for later use ;

[0038]Step 2: Under the protection of nitrogen, add 1.8g of dimethylolpropionic acid, 9g of N-methylpyrrolidone, 0.8g of 1,4-cyclohexanedimethanol, and 1.5g of methoxypolyethylene glycol into the reaction kettle , step 1 to obtain 25g of alkyd resin mixture, stir the mixture until a transparent solution is obtained, keep the temperature of the mixture at 50 degrees C...

Embodiment 2

[0044] Step 1: Add 22 g of diethanolamine and 0.25 g of sodium methoxide to the reaction kettle, heat the mixture to 100 degrees Celsius, and after the sodium methoxide is completely dissolved, add 122 g of sunflower oil under the protection of nitrogen, stir and heat to keep the temperature of the mixture at 105 degrees Celsius, use titration to measure the residual amine content in the mixture, stop stirring when the conversion rate of diethanolamine reaches 82%, and cool the solution to 67 degrees Celsius, add phosphoric acid 0.17g, keep 17min, then cool to room temperature for later use ;

[0045] Step 2: Under the protection of nitrogen, add 1.9 g of dimethylol propionic acid, 9.5 g of N-methylpyrrolidone, 0.9 g of 1,4-cyclohexanedimethanol, and 1.7 g of methoxypolyethylene glycol into the reaction kettle g, 27g of the alkyd resin mixture obtained in step 1, the mixture was stirred until a transparent solution was obtained, and the temperature of the mixture was kept at 5...

Embodiment 3

[0051] Step 1: Add 25g of diethanolamine and 0.3g of sodium methoxide into the reaction kettle, heat the mixture to 100 degrees Celsius, after the sodium methoxide is completely dissolved, add 125g of sunflower oil under the protection of nitrogen, stir and heat to keep the temperature of the mixture at 110 degrees Celsius, adopt titration to measure the residual amine content in the mixture, stop stirring when the conversion rate of diethanolamine reaches 85%, and cool the solution to 70 degrees Celsius, add phosphoric acid 2g, keep 20min, then cool to room temperature for standby;

[0052] Step 2: Under nitrogen protection, add 2 g of dimethylol propionic acid, 10 g of N-methylpyrrolidone, 1 g of 1,4-cyclohexanedimethanol, and 2 g of methoxypolyethylene glycol into the reaction kettle, step 1 Prepare 30 g of alkyd resin mixture, stir the mixture until a transparent solution is obtained, keep the temperature of the mixture at 55 degrees Celsius, add 10 g of toluene diisocyanat...

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Abstract

The invention discloses water-based paint with long opening time and a preparation method thereof. The water-based paint with long opening time mainly comprises diethanol amine, sodium methylate, sunflower seed oil, phosphoric acid, dimethylolpropionic acid, N-methyl pyrrolidone, 1,4-cyclohexane dimethanol, methoxy polyethylene glycol, toluene diisocynate, dipropylene glycol methyl ether, dimethylethanolamine, surface active agents, borax decahydrate, 12.5% of ammonium persulfate solution, wetting agents, methyl methacrylate, butyl acrylate, acrylic acid, 12.5% of ammonia water, titanium dioxide and deionized water. The preparation method comprises firstly preparing an isocyanate base polyurethane prepolymer and an acrylic acid polymer according to a formula, and then mixing the isocyanate base polyurethane prepolymer and the acrylic acid polymer. The water-based paint with low volatile organic compound (VOC) content, no toxicity and long opening time and wet-edge time can be obtained, leveling of emulsion surface, exhaust of air bubbles in a coating and directional arrangement of dispersing objects in the coating can be facilitated, and the good film-forming effect can be achieved.

Description

technical field [0001] The invention relates to a water-based paint and a preparation method thereof, in particular to a water-based paint with long open time and long wet edge time. Background technique [0002] The open time of the coating is a crucial parameter to characterize the film-forming performance of the coating. It refers to the period of time that the emulsion cannot flow freely on the surface of the coating film from the time when the emulsion is coated on the substrate to the wet film is formed. . If the opening time of the coating film is short, the brush marks on the surface of the coating cannot be leveled in a short time, causing the surface of the coating to be undulating after the dry film, which will affect the film formation. Therefore, sufficient opening time will help the surface of the emulsion Leveling, escape of air bubbles in the coating and orientation of dispersions in the coating. At present, the open time of organic solvent-based coatings c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/12C09D175/14C09D7/12C08F220/14C08F220/18C08G18/68
Inventor 陈海锋刘建新陈东辉
Owner 湖南福湘涂料股份有限公司
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